WordPress.com Stats doesn't accept API Key (2 posts)

WordPress.com Stats doesn't accept the API Key. It says: "The API key "############" belongs to the WordPress.com account of "#########". If this is not your account, please re-enter your API key." To test the API Key, I installed Akismet. That worked fine; the API was accepted by Akismet. Does anyone know how to fix this, so I can make use of WordPress.com Stats?